| Abstract
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This document specifies a Diameter application that allows to perform
the authentication, authorization, and collection of accounting
information for Session Initiation Protocol (SIP) services rendered
to a client node. This application, combined with the base Diameter
protocol and appropriate SIP extensions, allows SIP User Agents (UAs)
to obtain services from SIP servers that are connected to a Diameter
infrastructure. When combined with the Inter-Domain capability of
the base protocol, service may even be obtained from SIP servers that
Belinchon et all [Page 1]
INTERNET-DRAFT Diameter Multimedia Application October, 2002
belong to foreign domains, as would be encountered by roaming mobile
nodes.
Note that the specification defined here may be used independently of
the authentication technique used for authenticating a node's link
layer or network-layer access. In particular, we do not require that
the client node was authenticated for access with the use of either
the Mobile IP [4] or NASREQ [3] Diameter application.
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